Rotary engine.



No. 864,294. `PA'IEIT'LED AUG. 27, 1907. O. T.

ROTAR NGINE.

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PATENTE'D AUG. 27, 19o?.

aBBERT. ROTARY ENGINE. APPLIOATIOI FILED JUNE 14. 1907.

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OTTO EBERT, OF CLEVELAND, OHIO.

' RoTARY ENGINE Specicaton of Letters Patent.

Patented Aug. 27, 1907.

Application tiled June 14, 1907. Serial No. 379,011.

To all whom it may concern:

Be it known that I, OTTO EBERT, a citizen of the United States, residingat Cleveland, in the county oi Cuyahoga and State of Ohio, have inventedcertain new and useiul Improvements inRotary Engines, oi which thefollowing is a specification.

This invention is a rotary or turbine engine having for its object toprovide improved means for utilizing the steam expansively, the steamhaving a circumfer- The engine has an outer cylindrical casing formedof` two circular end plates 6 and a cylindrical rim or casing 7. Thisismounted upon suitable base, and the shaft Gr extends throughstufingboxes on the end plates.

The rotary piston consists of a hub H keyed tothe shaft, a web I, and arim L formed with a series of curved longitudinally extending blades Fthe edges oi which pass in contact with the rim 7 of the casing.

Steam chambers B are formed or cut in the inside of Vthe rim 7, andconnect at one end with the inlet D and at the other end with theexhaust E. The chambers B are divided into sets or expansion stages. Therst set comprise three chambers which are connected by passages A formedin the rim 7, and at the end of said set is a cut-ofi partition V.Thesecond set include two chambers Bf, connected by a passage A at theend of which is a partition M, and beyond this are successive sets B2and B3, with connecting passages A2 and A3, and a partition Ptherebetween.

The distance between the blades F is somewhat smaller than the length oithe chambers B, so that there are fewer chambers than blades. The resultof this is to divide the steam passage or chambers around the pistoninto a succession of stages delivering impulses successively to theblades and acting expansively from oneset of chambers to the other.Thus, in the position shown in Fig. 1,' steam entering the inlet Dpasses into the iirst chamber B and thence through the passages A to thesecond and third chambers, and while therein acts by impulse against theadjacent blades. When the blade indicated at Z moves to the edge of thepartition V the said three pressure chambers B are closed, and beingclosed will receive the full pressure or impact of the steam. Aftertraveling a sufficient distance to uncover the passages Af-whichdistance is about one-fourth the distance between the two blades, thepressure expands into the passages A and the chambers B/, thus bringingin two more blades and increasing the pressure area. The same movementcloses the passage at the point or partition M,'which produces or causesa pressure on the blades. Continued movement of the pistons cuts in thechambers B2 and additional blades; and so on until the exhaust E isreached, where the partition at Q4 cuts off .the last two chambers andallows the exhaust when the blade travels beyond the same, at whichinstant the piston will have rotated the space of one tooth and broughtthe parts into position for a fresh impulse. There are thus, in theembodiment shown, four successive expansion stages for ex haust.

Obviously any desired combination of chambers and blades may be used, toincrease or decrease the number of expansion stages, or vary the numberof chambers cut in at each stage.

The piston is rendered steam-tight by packing rings K at the edges,pressed by screws O, in the end plates 6.

The construction shown and disclosed gives an engine of high e'lciencyin small space, and with few and simple parts.

I claim:

1. In a rotary engine, the combination of a casing, and a rotary pistontherein with blades, the casing having a series of circumferentialchambers with partitions between the ends thereof positioned to besuccessively closed and then opened, by the passage of the blades acrossthe same, to successively cut in additional expansion chambers, thepartitions being of less width than the distance between the blades, andthe relative lengths of the chambers, and said distances being unequal.

2. In a rotary engine, the combination of a casing having a series ofchambers around in the rim thereof separated by partitions intosuccessive sets, the chambers of each set being connected by passages inthe casing, and a rotary piston in the casing with blades whichsuccessively pass said partitions as it rotates and successively cut inadditional chambers, the relative length of the chambers and thedistance between the blades being unequal.

3. In a rotary engine, the combination of a casing having a successionof chambers extending around the rim thereof from the inlet to theexhaust, said chambers being divided into a series of sets, and a rotarypiston in the casing with blades which pass the chambers, the distanceapart of the blades being slightly less than the length of the chambers,whereby said blades successively pass the divisions between the sets andvcut in additional sets.

In testimony whereof I do affix my signature, in presence of twowitnesses.

OTTO EBERT.

Witnesses EDITH D. COMER, JOHN A. BOMMHAEDT.

